JPS6213697A - Method of impermeable water membrane covering construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to coating the outer periphery of the lining segment of a tunnel constructed by the shield method with an impermeable membrane such as vinyl for waterproofing, or a box culvert. This invention relates to an impermeable membrane coating method for coating the outer periphery of a box culvert with an impermeable membrane in the conduit laying method.

[Prior Art] Taking the shield construction method as an example, the current shield construction method excavates the tunnel face with a cutter at the front end of the shield excavation tunnel, and while holding the face, the shield excavation machine is driven by the thrust of the shield jack at the rear. As the shield excavator moves forward, the segments are assembled at the rear of the shield excavator to complete the lining, and the gap between the lining and the surrounding ground is injected and filled with backfilling material. There is.

However, in the above-mentioned shield construction method, water often leaks into the tunnel from the joints or cracks of the segments during or after construction, and for this reason, water leakage prevention work has traditionally been required at the time of or after the completion of the shield construction. Furthermore, when groundwater overflows into the void between the segment and the ground, problems arise, such as the backfilling material injected into the tail void may be diluted by the groundwater.

In an attempt to solve this problem, recently, an impermeable membrane made of vinyl, polyethylene, etc. is placed in the gap between the segment and the ground as the shield tunneling machine moves to cover the entire circumference of the segment. is being carried out.

If the entire circumference of the segment is covered with an impermeable membrane and a backing material is filled between the impermeable membrane and the segment, the impermeable membrane prevents groundwater from reaching the outer surface of the segment and prevents the joint of the segment. The problems mentioned above, such as water leakage from the parts, will no longer occur.

A conventional device for covering the outer periphery of a segment with an impermeable membrane such as vinyl, as shown in FIG. A cylindrical impermeable membrane d is folded and stored in the permeable membrane storage part C, and can be pulled out from the rear end of the impermeable membrane storage part C along the inner surface of the shield frame b. An impermeable membrane d is drawn out into the gap (tail void) g between the segment e and the ground, and covers the outer periphery of the segment. In the figure,
h is a tail seal and i is a shield jack.

[Problems to be Solved by the Invention] However, the conventional impermeable membrane coating device described above has the following drawbacks because the impermeable membrane storage section is provided within the shield frame b of the shield tunneling machine a. There is.

(2) The tail void 9 is larger than that of a normal shield by the amount of the impermeable membrane housing portion C. That is, since the impermeable membrane storage part C is provided between the outer surface of the segment e and the shield frame b, the outer diameter of the shield frame b increases by the thickness of the impermeable membrane storage part C. Therefore, the amount of excavation and soil disposal increases, and the amount of backfill required for design increases.

■ From the above ■, the thickness of the impermeable membrane storage part C cannot necessarily be increased, and the shield frame b of the shield tunneling machine a
Since the water-impermeable membrane housing part C is incorporated into the inside of the water-impermeable membrane housing part C, there is a certain restriction on the size of the water-impermeable membrane housing part C, so that it cannot take up a large space. Therefore, it is not possible to increase the storage amount of the impermeable membrane d.

■ Since the impermeable membrane storage part C is provided inside the shield excavator a, the structure of the installation location of the impermeable membrane d becomes complicated due to the conflict with the main equipment of the shield excavator a, and the structure of the impermeable membrane d is It takes time and effort to incorporate it into the storage section C.

The present invention seeks to solve the various drawbacks of such conventional devices.

[Means for Solving the Problems] The present invention places an impermeable membrane having an appropriate length in front of an already assembled underground structure, and connects the impermeable membrane to the already installed impermeable membrane. The outer periphery of the underground structure is sequentially covered with the joined impermeable membrane.

[Function] Therefore, an impermeable membrane is laid before or during the assembly of the underground structure, and the underground structure is assembled within the laid impermeable membrane, and as a result, there is no impermeability around the periphery of the assembled underground structure. A water-permeable membrane is coated.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

In FIG. 1, 1 is a shield tunneling machine, 2 is a shield frame of the shield tunneling machine 1, 3 is a shield jack, 4 is a tail seal, 5 is a segment, and 6 is installed on the outer periphery of the segment 5. The impermeable membrane 7 covering the segment 5 is a backfilling material injection device for injecting a backfilling material 9 into the tail void formed between the impermeable membrane 6 and the ground 8.

In such a shield excavator 1, a segment assembly space 10 for assembling the segments 5 is formed at a rear position of the shield jack 3, and the segments 5 are assembled into a cylindrical shape in the segment assembly space 10. In the present invention, before assembling the segments 5, a band-shaped impermeable membrane 6° having a unit length slightly longer than the axial length of the segment 5 is arranged in the segment assembly space 10, and the impermeable membrane 6° is Both ends are lapped (wrapped part ) Joined using a joining device @11. Thus, the ring-shaped impermeable membrane 6 is also laid in the segment assembly space 10.

Once the impermeable membrane 6 is laid in the segment assembly space 10, the segments 5 are assembled into a cylindrical shape inside it. As a result, the outer periphery of the segment 5 in the segment assembly space 10 is covered with the impermeable membrane 6.

After the segment assembly space 10 is covered with the impermeable membrane 6, the shield excavator 1 is caused to dig by the shield jack 3. In this way, the segment assembly space 10 is again formed at the rear position of the shield jack 3, so the work of joining the impermeable membranes 6° and 6 and the work of assembling the segment 5 are performed in the same manner as above, and the same work is carried out thereafter. Repeat sequentially.

In the above embodiment, a band-shaped membrane was used as the water-impermeable membrane 6° before coating, but a ring-shaped membrane formed in advance may also be used. Further, as the bonding device 11, an ultrasonic oscillator, a high frequency oscillator (radiator, a heater, etc.) can be used.

FIG. 2 shows another example of the excavator 1 more suitable for carrying out the covering method of the present invention, in which the stem 3 of the shield jack 3
This is approximately twice the length of the conventional one. In FIG. 2, the upper stem 3' is shown in an extended state, and the lower stem 3' is shown in a contracted state.

With this method, segment assembly space 1
Since the impermeable membrane installation space 12 can be formed in front of the impermeable membrane 6° in the impermeable membrane installation space 12 while the segment 5 is being assembled in the segment assembly space 10, It is extremely efficient as it can perform the joint laying work at the same time.

Note that the present invention is not limited to the above-mentioned embodiments; for example, the impermeable membrane may be joined using an adhesive or an adhesive tape, regardless of the joining device, or may be applied to box culverts other than the shield construction method. The same method can be applied to underground structure construction methods such as conduit construction methods.

[Effects of the Invention] As explained above, according to the present invention, by adopting the shield construction method, box culvert laying conduit construction method, etc., the outer periphery of an underground structure can be covered and leakage to the inside can be reliably prevented. be able to.

In particular, when using the shield construction method, there is no need to provide a conventional impermeable membrane storage box inside the shield frame, so there is no need to increase the outer diameter of the shield frame or to incorporate the impermeable membrane. This is extremely advantageous.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the impermeable membrane coating method of the present invention, FIG. 2 is an explanatory diagram of another embodiment, and FIG. 3 is an explanatory diagram of a conventional example. 1 is a shield tunneling machine, 5 is a segment, 6 and 6 degrees are impermeable membranes, 10 is a segment assembly space, and 12 is an impermeable membrane installation space.

Claims (1)

[Claims] 1) Place an impermeable membrane with an appropriate length in front of the already assembled underground structure, join the impermeable membrane to the already installed impermeable membrane, and use the joined impermeable membrane to An impermeable membrane coating method characterized by sequentially coating the outer periphery of an underground structure.